600
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liters
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minutes
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600
g
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liters
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g
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minutes
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g
The Vegetable Boiling Calculator provides raw quantities, water volumes, salt amounts, and estimated boiling times for cooking vegetables in water. While boiling is the most common method for cooking vegetables worldwide, it is often done poorly — using too little water, not enough salt, and cooking for too long. This calculator helps you get the quantities right for a properly executed boil.
Boiling vegetables involves submerging them in hot water at 100°C. Heat transfers from the water into the vegetable, cooking it from the outside inward. The rate at which this happens depends almost entirely on the vegetable's density and the size of the pieces. Leafy vegetables have very thin cell walls and high water content — a few minutes of boiling is enough to make them tender. Dense root vegetables have thick, starchy cells that require sustained heat to gelatinize the starch and soften the cellulose framework — typically 15–25 minutes for whole or large pieces.
The most important principle for boiling vegetables is to use plenty of water. A large volume of water maintains its temperature when vegetables are added, so it returns to a boil quickly. If you use too little water, the temperature drops dramatically when cold vegetables are added, extending cooking time and leading to uneven, waterlogged results. The general rule is at least 1 liter of water per 250 g of vegetables — this calculator uses a slightly more generous ratio for best results.
Salting the cooking water is strongly recommended by professional cooks. The common instruction to add salt 'until the water tastes like the sea' (approximately 10 g per liter) seasons the vegetable from the inside out, producing a more complex, palatable result. The amount of salt absorbed by the vegetable is small — far less than is typically added at the table — but the difference in flavor between salted and unsalted cooking water is significant.
One important limitation of boiling compared to other methods is nutrient loss. Water-soluble vitamins (particularly vitamin C and the B vitamins) leach from the vegetable into the cooking water. This loss can be 40–60% for vitamin C in prolonged boiling. To minimize this, cook vegetables only until tender (do not over-boil), use a minimum amount of water, and consider using the cooking water in sauces or stocks to recover some of the leached nutrients.
Total raw weight = Servings × Serving size (g)
Water volume: 2 L for ≤500 g, 3 L for ≤1000 g, 4 L for more
Salt: 10 g per liter of water (standard culinary ratio)
Boil times: Leafy = 3 min, Medium = 7 min, Root = 20 min, Fresh legumes = 5 min
Cooked weight = Raw weight × Yield (leafy 0.85, medium 0.88, root 0.90, legumes 0.92)
Boiling times are measured from when the water returns to a full boil after adding the vegetables. Root vegetable times assume medium-sized pieces (3–4 cm). Whole root vegetables will take considerably longer. Begin testing for doneness 2 minutes before the estimated time by piercing with a skewer.
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Boil 600 g green beans in 2 L salted water (20 g salt) for about 7 minutes for tender-crisp results.
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1.2 kg diced potatoes need 4 L of water with 40 g of salt, and about 20 minutes to cook through.
It depends on the vegetable. Root vegetables (potatoes, beets, carrots) should generally start in cold water — this allows them to cook evenly from the inside out as the water heats. Green vegetables (beans, broccoli, peas) should be added to already-boiling water to minimize time at lower temperatures, which causes loss of color and vitamins.
A professional guideline is 10 g of salt per liter of water — about 1 teaspoon per liter. This sounds like a lot but only a fraction is absorbed by the vegetable. It makes a notable difference to flavor, especially for starchy vegetables like potatoes and corn.
A covered pot reaches boiling faster and maintains temperature more efficiently. For most vegetable boiling, keeping the lid on saves energy and time. For green vegetables where you want to preserve color, some cooks boil uncovered to let volatile acids (which contribute to chlorophyll breakdown) escape — though the effect is modest compared to cooking time.
Use plenty of boiling, well-salted water and cook for the minimum time necessary. Do not overcook. Immediately transfer to ice-cold water (blanching) after boiling to halt the cooking process and fix the bright green color. This technique is used by professional kitchens for all blanched green vegetables.
It was overcooked. Broccoli florets need only 4–6 minutes in boiling water for tender-crisp texture. At 8–10 minutes it becomes soft, and beyond that mushy and grey. Use a timer and taste-test at the minimum recommended time.
Yes, and this is highly recommended for nutritional value. The boiling water contains leached vitamins, minerals, and flavor compounds. Use it as a base for soups, stews, gravies, or bread dough. It is particularly flavorful after cooking potatoes, corn, or asparagus.
Not all, but some significant losses occur for water-soluble vitamins. Vitamin C losses range from 40–60% depending on cooking time and water volume. B vitamins lose 10–30%. Fat-soluble vitamins and minerals are less affected. Shorter cooking times and less water reduce losses.
Blanching is a two-step process: briefly boiling vegetables (1–3 minutes) then immediately plunging them into ice water to stop cooking. It preserves color, texture, and some nutrients. It is used to prepare vegetables for freezing, salads, or as a step before sautéing. Full boiling cooks to final doneness without the cold-water stop.
No — unlike pasta, oil in vegetable boiling water serves no purpose. Oil and water do not mix, so the oil floats on the surface and does not coat or benefit the vegetables. Season with oil or butter after draining instead.
Cut them into uniform pieces of the same size. This is the single most effective technique for even cooking. Starting in cold water also helps — as the water heats gradually, the heat penetrates more evenly compared to adding cold dense vegetables to already boiling water.
Roboculator Team
The Roboculator Team explains calculations, planning tools, and practical formulas in clear language for real-life situations.
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